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From: boris <boris@localhost.domain>
Newsgroups: comp.lang.java.programmer
Subject: Re: large xml file...
Date: Mon, 22 Aug 2011 20:53:36 -0400
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On 08/22/2011 08:43 PM, Ian Shef wrote:
> boris<boris@localhost.domain>  wrote in news:j2uqp4$n8h$1
> @speranza.aioe.org:
>
>> hi all,
>> I need to process large xml file and dump some documents to a different
>> file based on content of some elements.
>>
>> let's say I need to check content of<text3>  and dump the whole<doc>  to
>> a different file:
>>
>> <doc>
>>       <text1>
>>       <text2>
>>       <text3>   ... etc
>>
>> </doc>
>>
>> I'm trying to do this using sax. Are there any examples how to do this?
>> Is using sax ok for this task?
>> thanks.
>>
>>
>>
>
> What you are asking is unclear to me.
> Do you mean that<text3>  will determine whether you dump the whole<doc>  to
> another file?
> Do you mean that<text3>  will determine what file the whole<doc>  will be
> dumped to?
> Or do you mean that the whole<doc>  will be dumped to some other file, and
> while you are at it,<text3>  will also be checked and reported in some way?
>
> Can you read the "large xml file" twice?
> Can you put the whole "large xml file" (or at least the part preceeding
> <text3>) into memory?
> Can you copy the "large xml file" to another file while it is being
> processed?
>
> Sorry about the questions, but I need clarification.  I have used SAX and
> may be able to provide enlightenment.  SAX has its uses, but is not so good
> when 'memory' is involved unless _you_ provide the memory.  SAX appears to
> excel when processing can take place in a single pass with very little
> lokking backwards.  Consequently, it does not use as much memory as some
> other methods.
>

 > Do you mean that<text3>  will determine whether you dump the 
 >whole<doc>  to
 > another file?
yes


 > Can you read the "large xml file" twice?
I would like to read it once.

 > Can you put the whole "large xml file" (or at least the part >preceeding
 > <text3>) into memory?
no.